JP6311540B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve that opens and closes a fluid passage.

  Conventionally, as this kind of solenoid valve, there is one described in Patent Document 1, for example. In the electromagnetic valve described in Patent Document 1, a movable member that is attracted to the stator core side by a magnetic attraction force and a valve member that opens and closes a fluid passage formed in the seat member are configured separately.

  Further, the valve member has a shaft portion slidably inserted into the seat member, and one end side thereof is in contact with the movable member. When the coil is not energized, the valve member is energized by the first spring through the movable member and driven in the valve opening direction. When the coil is energized, the valve member is directly energized by the second spring to move. It is adapted to follow the member.

  Furthermore, the outer diameter of the contact portion between the movable member and the valve member is smaller than the coil center diameter of the second spring, which is a cylindrical coil spring.

JP2013-241952A

  However, in the conventional solenoid valve, since the outer diameter of the contact portion between the movable member and the valve member is smaller than the coil center diameter of the second spring, the circumferential force non-uniformity of the spring force and the movable member and the valve member Due to the eccentric force due to the shaft misalignment, the valve member easily tilts in the guide hole of the seat member. Since the sliding resistance between the valve member and the seat member increases due to the inclination of the valve member, a response delay occurs. Further, when the valve member is actuated by the tilting of the valve member, the valve member is in contact with the seat member while the tilt is canceled after a part of the circumferential direction of the valve member is in contact with the seat member. Occur. That is, there arises a problem that the response time of the valve member varies depending on the degree of inclination of the valve member.

  In view of the above points, an object of the present invention is to reduce variations in response time of valve members.

In order to achieve the above object, according to the first aspect of the present invention, a coil (15) that forms a magnetic field when energized, a stator core (10) that generates a magnetic attractive force when the coil is energized, and a stator core that generates magnetic attractive force The movable member (18, 22) sucked to the side, the sheet member (23) in which the fluid passage (231) is formed, the shaft portion is slidably inserted into the sheet member, and the end portion contacts the movable member. A valve member (25, 26) that contacts and opens and closes the fluid passage in conjunction with the movable member, and a first spring that biases the valve member in a predetermined direction via the movable member when the coil is not energized. 21) and a second spring (27) for biasing the valve member so that the contact portion with the valve member has an annular shape and the valve member follows the movable member when the coil is energized. Of the contact parts between the valve and the valve member Even one, is constituted by an annular protrusion (221),
The second spring is a cylindrical coil spring, and the inner diameter of the protrusion is larger than the coil center diameter of the second spring .

  According to this, since the diameter of the contact portion between the movable member and the valve member is increased, the inclination of the valve member is generated even if the spring force is not uniform in the circumferential direction or the movable member and the valve member are misaligned. It becomes difficult to do. Therefore, variation in response time of the valve member can be reduced.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is sectional drawing which shows the solenoid valve which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the solenoid valve which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described.

  The solenoid valve of the present invention is used, for example, as an intake metering valve of a fuel injection device that supplies fuel to an internal combustion engine (more specifically, a diesel engine). Note that the fuel injection device includes a pump that increases the pressure of the fuel and pumps the fuel, a common rail that stores fuel that has been increased in pressure by the pump, and the like. The intake metering valve adjusts the flow rate of the fuel supplied to the pump.

  As shown in FIG. 1, a bottomed cylindrical stator core 10 made of a ferromagnetic metal and a cylindrical sleeve 11 made of a ferromagnetic metal are interposed via a cylindrical collar 12 made of an antiferromagnetic metal. It is integrated. Specifically, the opening side end of the stator core 10 and the collar 12 are hermetically joined by welding or brazing, and the sleeve 11 and the collar 12 are also hermetically joined by welding or brazing. A substantially cylindrical guide 13 made of metal is hermetically joined to the sleeve 11 by welding or brazing.

  The yoke 14 is made of a ferromagnetic metal and is formed in a substantially cylindrical shape. The yoke 14 is disposed on the outer peripheral side of the stator core 10, and one end surface thereof is in contact with the end surface of the guide 13.

  The coil 15 forms a magnetic field when energized, is formed in a cylindrical shape by winding a coil wire around a bobbin, and is disposed between the stator core 10 and the yoke 14. The stator core 10 generates a magnetic attractive force when the coil 15 is energized.

  The plate 16 is formed in a ring shape with a ferromagnetic metal, and is disposed on the outer peripheral side of the bottom of the stator core 10 to form a magnetic circuit between the stator core 10 and the yoke 14. Further, the plate 14 and the stator core 10 are screwed together to join the plate 16 and the stator core 10, so that the yoke 14 is sandwiched between the plate 16 and the guide 13.

  An armature chamber 17 is defined by the stator core 10, the sleeve 11, the collar 12, and the guide 13. The armature chamber 17 is divided into two chambers by an armature 18 (described later in detail) housed in the armature chamber 17. Specifically, it is divided into a first armature chamber 170 located on the stator core 10 side with respect to the armature 18 and a second armature chamber 171 located on the side opposite to the stator core with respect to the armature 18.

  A first spring chamber 19 that communicates with the first armature chamber 170 is formed in the stator core 10. In the first spring chamber 19, a cylindrical core-side stopper 20 and a first spring 21 that urges the armature 18 in a direction away from the stator core 10 are arranged.

  The core-side stopper 20 is positioned on the bottom side of the first spring chamber 19, is a cylindrical spring receiving portion 200 that receives one end of the first spring 21, and is positioned on the inner side of the first spring 21 to be described later. A cylindrical stopper portion 201 that restricts the movement range of the armature 18 toward the stator core 10 by contact with the armature 18 is provided.

  The armature 18 is made of a ferromagnetic metal and is formed in a cylindrical shape. A metal cylindrical shaft 22 is inserted into the armature 18 at the center in the radial direction. The armature 18 and the shaft 22 are joined by welding.

  One end face of the armature 18 faces the stator core 10, and the armature 18 and the shaft 22 are attracted to the stator core 10 side by a magnetic attraction force. The armature 18 and the shaft 22 constitute a movable member of the present invention.

  One end of the shaft 22 protrudes from the armature 18 toward the guide 13, and a protruding portion of the shaft 22 is slidably inserted into a guide hole 130 formed in the guide 13.

  At one end of the shaft 22, a recess 220 is formed at the center in the radial direction, and an annular protrusion 221 that surrounds the recess 220 and protrudes toward the spring holder 26 described later is formed.

  The other end of the shaft 22 faces the stopper portion 201 of the core-side stopper 20, and the movement range of the armature 18 toward the stator core 10 is regulated by the contact between the stopper portion 201 and the shaft 22. Yes.

  A cylindrical sheet member 23 made of metal is joined to the opposite side of the guide 13 by welding. A second spring chamber 24 is formed by the guide 13 and the sheet member 23.

  The seat member 23 has a seat portion hole 230 into which a shaft portion of a valve body 25 described later is slidably inserted, a fluid passage 231 through which a fluid flows, and the valve body 25 positioned in the fluid passage 231. A sheet surface 232 is formed.

  The valve body 25 is formed in a columnar shape with metal. A valve portion 250 that opens and closes the fluid passage 231 while being in contact with and away from the seat surface 232 is formed on one end side of the valve body 25. The other end side of the valve body 25 protrudes into the second spring chamber 24, and the other end side end surface faces the end surface of the shaft 22. A notch 251 that allows the second spring chamber 24 and the fluid passage 231 to communicate with each other is formed on the outer peripheral surface of the shaft portion of the valve body 25.

  On the other end side of the valve body 25, a spring holder 26 formed in a cylindrical shape with metal is fixed by press-fitting or caulking. The valve body 25 and the spring holder 26 are biased toward the shaft 22 by the second spring 27 sandwiched between the spring holder 26 and the seat member 23. Further, one end surface of the spring holder 26 faces the protruding portion 221 of the shaft 22. In addition, the valve body 25 and the spring holder 26 comprise the valve member of this invention.

  The second spring 27 is a cylindrical coil spring. Therefore, the contact portion between the spring holder 26 and the second spring 27 is annular. Further, the shaft 22, the valve body 25, the spring holder 26 and the second spring 27 are arranged coaxially. The inner diameter of the protrusion 221 is set larger than the coil center diameter of the second spring 27.

  In the above configuration, when the coil 15 is energized, the armature 18 and the shaft 22 are attracted toward the stator core 10 against the biasing force of the first spring 21, and the valve body 25 and the spring holder 26 biased by the second spring 27. Moves following the armature 18 and the shaft 22, the valve portion 250 of the valve body 25 is seated on the seat surface 232, and the fluid passage 231 is closed.

  On the other hand, when the energization of the coil 15 is stopped, the armature 18 and the shaft 22 are urged by the first spring 21 and move toward the valve body 25 (that is, away from the stator core 10), and the shaft 22 The protrusion 221 contacts the spring holder 26.

  Further, when the protruding portion 221 of the shaft 22 contacts the spring holder 26, the valve body 25 and the spring holder 26 are urged by the first spring 21 via the shaft 22, and the valve portion 250 of the valve body 25 is moved to the seat surface. The fluid passage 231 is opened away from 232.

  Here, since the concave portion 220 is formed in the central portion of the shaft 22 in the radial direction, the central portion of the shaft 22 in the radial direction does not abut against the spring holder 26 and is located away from the central portion in the radial direction of the shaft 22. A projection 221 contacts the spring holder 26.

  Therefore, since the diameter of the contact portion between the shaft 22 and the spring holder 26 is increased, even if the shaft 22 and the spring holder 26 are misaligned, the protruding portion 221 of the shaft 22 and the spring holder 26 are in contact with each other. At this time, the inclination of the valve body 25 and the spring holder 26 hardly occurs.

  As a result, the sliding resistance between the valve body 25 and the seat member 23 is reduced, and the entire circumference of the valve portion 250 immediately comes into contact with the seat surface 232 when the valve is closed, so that the responsiveness of the valve body 25 is improved. As a result, variation in the response time of the valve body 25 is reduced.

  In particular, as in this embodiment, by setting the inner diameter of the protrusion 221 to be larger than the coil center diameter of the second spring 27, the diameter of the contact portion between the shaft 22 and the spring holder 26 is sufficiently increased. Thus, the inclination of the valve body 25 and the spring holder 26 when the protrusion 221 of the shaft 22 abuts against the spring holder 26 is less likely to occur.

  As is apparent from the above description, according to the present embodiment, the valve body 25 and the spring holder 26 are less likely to be inclined, so that variations in the response time of the valve body 25 can be reduced.

(Second Embodiment)
A second embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

  As shown in FIG. 2, the inner peripheral side of the protruding portion 221 of the shaft 22 is a tapered surface that increases in diameter from the stator core 10 (see FIG. 1) side toward the spring holder 26 side.

  Further, in the spring holder 26, a portion facing the inner peripheral side (that is, a portion having a tapered surface) of the protruding portion 221 of the shaft 22 is directed from the shaft 22 side toward the sheet member 23 (see FIG. 1) side. The taper surface expands in diameter.

  Then, when the tapered surface of the shaft 22 and the tapered surface of the spring holder 26 come into contact with each other, the positions of the shaft 22 and the spring holder 26 are adjusted in a direction in which both axes coincide with each other, and the posture of the valve body 25 and the spring holder 26 is changed. Further stabilization can be achieved.

  Therefore, according to this embodiment, the variation in the response time of the valve body 25 can be further reduced.

(Other embodiments)
In each of the above embodiments, the electromagnetic valve of the present invention is applied to the intake metering valve of the fuel injection device for an internal combustion engine, but the present invention can be widely applied to an electromagnetic valve that opens and closes a fluid passage.

  Further, in each of the above embodiments, the annular protrusion 221 is formed on the shaft 22, but the annular protrusion is formed on the spring holder 26 so that the protrusion of the spring holder 26 is in contact with the shaft 22. Also good.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

  Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

  In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

  Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

10 Stator core 15 Coil 18 Armature (movable member)
21 First spring 22 Shaft (movable member)
23 Sheet member 25 Valve body (valve member)
26 Spring holder (valve member)
27 Second spring 231 Fluid passage

Claims (2)

A coil (15) that forms a magnetic field when energized;
A stator core (10) that generates a magnetic attractive force when energized to the coil;
Movable members (18, 22) attracted to the stator core by the magnetic attraction force;
A sheet member (23) in which a fluid passage (231) is formed;
A valve member (25, 26) having a shaft portion slidably inserted into the seat member, an end portion contacting the movable member, and opening and closing the fluid passage in conjunction with the movable member;
A first spring (21) for biasing the valve member in a predetermined direction via the movable member when the coil is not energized;
A second spring (27) for biasing the valve member so that the contact portion with the valve member has an annular shape and the valve member follows the movable member when the coil is energized;
At least one of the abutting portions between the movable member and the valve member is composed of an annular protrusion (221) ,
The second spring is a cylindrical coil spring;
The solenoid valve according to claim 1, wherein an inner diameter of the protrusion is larger than a coil center diameter of the second spring . The electromagnetic valve according to claim 1 , wherein a contact surface between the movable member and the valve member is tapered.

Images